Roman Numerals: Step 6

We’re working on passing test cases 1 through 5.

The simplest code that will work is this:

static const std::string ToRoman(int n)
{
    if (n == 5)
        return "V";

    if (n == 4)
        return "IV";

    std::string s;
    for (int i=0; i<n; ++i)
        s += "I";

    return s;
}

Ok, but it doesn’t feel all that great. We’re handling 5 specially, 4 specially and the rest with a loop. By being a little prescient, I know that I’ll want to put the “V” in a std::string and let it fall down to the loop, appending enough “I” characters to handle 5, 6, 7, and 8. I could refactor now, but let’s be deliberate and save that for the next test case.

Go ahead and move the /* down below the 6. Build and test: it should fail like this: Assert failed. Expected:<VI> Actual:<IIIIII>.

Write just enough code to pass 6. Then click Next.